CN112468942A

CN112468942A - Bone conduction loudspeaker

Info

Publication number: CN112468942A
Application number: CN202011452227.1A
Authority: CN
Inventors: 彭海龙
Original assignee: Shenzhen Yuyuantong Technology Co ltd
Current assignee: Shenzhen Yuyuantong Technology Co ltd
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2021-03-09

Abstract

The invention discloses a bone conduction loudspeaker, which comprises a conduction shell, a sound control sheet arranged at one end of the conduction shell and contacted with the conduction shell, and an accommodating space formed by the conduction shell and the sound control sheet in a surrounding manner, wherein the accommodating space accommodates a coil and a magnetic assembly for generating a magnetic field, the magnetic assembly, the conduction shell and the sound control sheet form a magnetic loop, and the conduction shell and the sound control sheet are respectively made of electroacoustic materials with different thicknesses. According to the invention, the magnetic assembly, the conduction shell and the sound control sheet form a magnetic loop so as to form a magnetic system, the coil generates an alternating magnetic field after being electrified, the alternating magnetic field enables the magnetic field intensity of the magnetic system to change so as to enable the sound control sheet and the conduction shell to vibrate, and further enable people to sense sound through bone conduction, the conduction shell and the sound control sheet are respectively made of materials with different thicknesses, and the mixing of different high pitch, middle pitch and/or low pitch can be realized by utilizing the relation between the vibration frequency and the sound of an object, so that the requirements of users on the sound with different frequency bands can be met.

Description

Bone conduction loudspeaker

Technical Field

The invention relates to the technical field of acoustic conversion, in particular to a bone conduction loudspeaker.

Background

Bone conduction is a sound conduction mode, namely, the sound is converted into mechanical vibration with different frequencies, sound waves are transmitted through the skull, the bone labyrinth, the lymph transmission of the inner ear, the spiral organ, the auditory nerve and the auditory center of a person, compared with the classical sound conduction mode of generating the sound waves through the vibrating diaphragm, the bone conduction omits a plurality of sound wave transmission steps, clear sound restoration can be realized in a noisy environment, and the sound waves can not influence other people due to diffusion in the air.

The bone conduction speaker is a novel electroacoustic conversion device developed based on the sound conduction mode of bone conduction, and can convert an electric signal into a mechanical vibration signal, and transmit the vibration signal into a cochlea through human tissues and bones, so that a user can hear sound, and the eardrum of people can not be damaged due to clear bone conduction sound without being influenced by the external environment, and therefore the bone conduction speaker is widely applied to the fields of earphones and the like. However, most of the sounds transmitted by the conventional bone conduction vibration speaker are low-frequency sounds, and the frequencies of the transmitted sounds are single, so that the pursuit of users for sounds in other different frequency bands cannot be met.

Disclosure of Invention

The invention aims to provide a bone conduction loudspeaker capable of realizing mixed presentation of sounds of different frequency bands.

In order to solve the above technical problems, the present invention provides a bone conduction speaker, which includes a conduction shell, a sound control plate disposed at one end of the conduction shell and contacting with the conduction shell, and an accommodation space surrounded by the conduction shell and the sound control plate, wherein the accommodation space accommodates a coil and a magnetic component for generating a magnetic field, the magnetic component, the conduction shell and the sound control plate form a magnetic loop, and the conduction shell and the sound control plate are made of electroacoustic materials with different thicknesses.

The further technical scheme is as follows: the thickness of the conductive shell is 0.15-0.5 mm.

The further technical scheme is as follows: the thickness of the sound control sheet is 0.8-1.4 mm.

The further technical scheme is as follows: the magnetic assembly comprises a first magnet and a second magnet which are respectively arranged on two sides of the coil.

The further technical scheme is as follows: the bone conduction speaker further comprises a conduction bracket positioned at the bottom of the conduction shell, the coil is positioned on the conduction bracket, and the magnetic component is positioned on the conduction shell.

The further technical scheme is as follows: the thickness of the conduction support is 0.4-0.8 mm.

The further technical scheme is as follows: the conduction shell comprises a first top plate, two first supporting plates and second supporting plates, wherein the two first supporting plates are formed by downwards extending from two opposite sides of the first top plate, the second supporting plates are formed by inwards bending the bottom ends of the two first supporting plates respectively, a rectangular groove is formed in the first top plate, the sound control piece corresponds to the rectangular groove and is connected to the first top plate, and the conduction support is attached to the bottom of the second supporting plate.

The further technical scheme is as follows: accuse sound piece is "ten" style of calligraphy, including being located the diaphragm of rectangular channel top and the riser of being connected with the diaphragm, riser both ends butt is fixed in first roof top surface.

The further technical scheme is as follows: the length and the width of the transverse plate are smaller than those of the rectangular groove.

The further technical scheme is as follows: the coil is sleeved on the guide post so as to be fixed on the conduction bracket through the guide post.

Compared with the prior art, the coil and the magnetic assembly for generating the magnetic field are accommodated in the accommodating space formed by the conduction shell and the sound control sheet, the magnetic assembly, the conduction shell and the sound control sheet form a magnetic loop, thereby forming a magnetic system, the coil generates an alternating magnetic field after being electrified, the alternating magnetic field changes the magnetic field intensity of the magnetic system formed by the magnetic component, the conduction shell and the sound control sheet, thereby leading the sound control sheet and the conduction shell to vibrate, leading the end surfaces of the sound control sheet and the conduction shell to be in direct contact with the human body to transmit the sound to the human bone, thereby inducing the human body to sense the sound through the bone conduction, and the conduction shell and the sound control sheet are respectively made of materials with different thicknesses, the thickness of the conductive shell is different from that of the sound control sheet, and the mixing of different high pitch, middle pitch and/or low pitch can be realized by utilizing the relation between the vibration frequency of the object and the sound, so that the requirements of users on the sound of different frequency bands can be met.

Drawings

Fig. 1 is a schematic perspective view of a bone conduction speaker according to an embodiment of the present invention.

Fig. 2 is a schematic top view of the bone conduction speaker of fig. 1.

Fig. 3 is a schematic cross-sectional view of the bone conduction speaker of fig. 1.

Fig. 4 is a schematic diagram of the frequency response curve of the bone conduction speaker of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood by those skilled in the art, the present invention is further described with reference to the accompanying drawings and examples.

Referring to fig. 1 to 3, fig. 1 to 3 show an embodiment of a bone conduction speaker 1 according to the present invention. In the embodiment shown in the drawings, the bone conduction speaker 1 includes a conductive shell 20, a sound control plate 10 disposed at one end of the conductive shell 20 and contacting the conductive shell 20, and a receiving space 70 surrounded by the conductive shell 20 and the sound control plate 10, wherein the receiving space 70 receives a coil 30 and a magnetic component for generating a magnetic field, the magnetic component forms a magnetic circuit with the conductive shell 20 and the sound control plate 10, and the conductive shell 20 and the sound control plate 10 are made of electro-acoustic materials with different thicknesses, respectively, the electro-acoustic materials include silicon steel plates, ferrite, iron, or the like. In the present invention, the magnetic assembly, the conductive shell 20 and the sound control plate 10 form a magnetic loop to form a magnetic system, the coil 30 is energized to generate an alternating magnetic field, the alternating magnetic field changes the magnetic field strength formed by the magnetic assembly, the conductive shell 20 and the sound control plate 10, i.e. the magnetic field force received by the conductive shell 20 and the sound control plate 10 changes, the change of the force causes the sound control plate 10 and the conductive shell 20 to vibrate, and the electroacoustic materials with different thicknesses are vibrated to generate high, medium and low audio frequencies respectively according to the relationship between the object vibration frequency and the sound because the thicknesses of the sound control plate 10 and the conductive shell 20 are different, so that the bone conduction speaker 1 can realize the mixing of various sound qualities such as different high, medium and/or low tones and present the mixed sound to the user.

Preferably, in the present invention, the thickness of the conductive shell 20 is 0.15-0.5mm, and the thickness of the sound-controlling piece 10 is 0.8-1.4 mm. In the embodiment, the two electroacoustic materials with different thicknesses can be connected together through laser welding, and the magnetic field generates different frequency band vibration on the materials with different thicknesses, so that the requirements of users on different frequency band sounds are met.

In some embodiments, the bone conduction speaker 1 further comprises a conductive support 50 located at the bottom of the conductive housing 20, the coil 30 is located on the conductive support 50, and the magnetic assembly is located on the conductive housing 20. And the thickness of the conductive support 50 is 0.4-0.8 mm. Further, in this embodiment, a guide post 60 is disposed at the middle of the conducting bracket 50, and the coil 30 is sleeved on the guide post 60 to be fixed on the conducting bracket 50 through the guide post 60. In the present invention, there is a gap between the guide post 60 and the side wall of the conductive shell 20, the guide post 60 is used for magnetic conduction to form a magnetic field perpendicular to the bottom of the conductive bracket 50, and the side wall of the conductive shell 20 can also play a role of magnetic conduction.

In the embodiment shown in the drawings, the magnetic assembly comprises a first magnet 401 and a second magnet 402 which are respectively arranged at two sides of the coil 30, and the double-magnet driving is adopted in the invention, so that the electric sound is converted into the mechanical vibration, and the conversion efficiency is high. Specifically, in this embodiment, the first magnet 401 and the second magnet 402 are symmetrically disposed on the conductive bracket 50 with the guide post 60 as the center to form a uniform magnetic field, so that the sensitivity is high, the self-consumption of audio transmission can be reduced as much as possible, and the electromagnetic coupling between the two magnets and the coil can be ensured, thereby improving the sound quality of the bone conduction speaker 1. The first magnet 401 and the second magnet 402 may be magnets made of alloy permanent magnet materials including but not limited to neodymium iron boron, samarium cobalt, alnico, iron chromium cobalt, aluminum iron boron, and iron carbon aluminum or ferrite permanent magnet materials including but not limited to barium ferrite, iron ferrite, manganese ferrite, and lithium manganese ferrite. It is understood that, in the present invention, the magnetic member is not limited to include 2 magnets, but may be an even number of 4, 6, or 8 magnets as long as a uniform magnetic field is formed.

In this embodiment, the conductive shell 20 includes a first top plate 201, two first supporting plates 202 extending downward from two opposite sides of the first top plate 201, and second supporting plates 203 bent inward from bottom ends of the two first supporting plates 202, the first magnet 401 and the second magnet 402 are respectively located on the two second supporting plates 203, the first top plate 201 is provided with a rectangular groove 204, the sound-controlling piece 10 is connected to the first top plate 201 corresponding to the rectangular groove 204, and the conductive bracket 50 is attached to bottoms of the two second supporting plates 203.

In some embodiments, the sound-controlling sheet 10 is in a cross shape, and includes a horizontal plate 101 located above the rectangular groove 204 and a vertical plate 102 connected to the horizontal plate 101, two ends of the vertical plate 102 are fixed to the top surface of the first top plate 201 in an abutting manner, two ends of the vertical plate 102 are welded to the top surface of the first top plate 201 by laser, and are overlapped with the first top plate 201, and a magnetic field can obtain a middle sound through the overlapped part of two materials with different thicknesses. Preferably, the size of sound control piece 10 is less than the size of rectangular groove 204, that is, the length and the width of horizontal plate 101 are less than the length and the width of rectangular groove 204, sound distribution groove 80 is formed between the periphery of the bottom of horizontal plate 101 and the wall of rectangular groove 204, that is, a gap is left between the periphery of the bottom of horizontal plate 101 and rectangular groove 204, so that the space between conductive shell 20 and sound control piece 10 is not sealed, sound mixing is avoided, and sound output effect can be improved.

Fig. 4 is a schematic frequency response curve of the bone conduction speaker of the present invention, in which the solid line is the frequency response curve of the bone conduction speaker of the prior art and the dotted line is the frequency response curve of the bone conduction speaker of the present invention. It can be known from the figure that the frequency response actually generated by the bone conduction speaker of the prior art is steep, and the tone quality is poor, while the frequency response of the audio signal after mixing the high, medium and low audio frequencies generated by the vibration in the bone conduction speaker of the present invention is flatter, the sound is broader, meanwhile, the resonance response range is widened, and the tone quality is better, and it can be known from the figure that the sound pressure level value (sound magnitude) of the bone conduction speaker of the present invention is greater than that of the bone conduction speaker of the prior art when the frequencies are the same, and the sensitivity of the bone conduction speaker of the present invention is higher.

In summary, in the present invention, the coil and the magnetic assembly for generating the magnetic field are accommodated in the accommodating space surrounded by the conductive shell and the sound control plate, the magnetic assembly, the conductive shell and the sound control plate form a magnetic loop, so as to form a magnetic system, the first magnet and the second magnet in the magnetic assembly form a uniform magnetic field, the coil is electrified to generate an alternating magnetic field, the conductive shell and the sound control plate are acted by the two magnetic fields, the alternating magnetic field changes the magnetic field strength of the magnetic system formed by the magnetic assembly, the conductive shell and the sound control plate, so as to cause the conductive shell and the sound control plate to generate vibration, when a wearer uses the magnetic system, the sound control plate and the first top plate of the conductive shell directly contact with the human body, the vibration is transmitted to the ear part through the bone of the wearer, so as to induce sound, and the conductive shell and the sound control plate are respectively made of materials with different thicknesses, the thickness of the conductive shell is different from that of the sound control sheet, and the mixing of different high pitch, middle pitch and/or low pitch can be realized by utilizing the relation between the vibration frequency of the object and the sound, so that the requirements of users on the sound of different frequency bands can be met.

The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Various equivalent changes and modifications can be made by those skilled in the art based on the above embodiments, and all equivalent changes and modifications within the scope of the claims should fall within the protection scope of the present invention.

Claims

1. A bone conduction speaker, characterized by: bone conduction speaker includes the conduction shell, locates conduction shell one end and the accommodation space who surrounds the formation with the accuse sound piece that conduction shell contacted and by conduction shell and accuse sound piece, accommodation space accepts coil and the magnetic component who is used for producing the magnetic field, magnetic component, conduction shell and accuse sound piece form the magnetic circuit, just conduction shell and accuse sound piece are made by the electroacoustic material of different thickness respectively.

2. The bone conduction speaker of claim 1, wherein: the thickness of the conductive shell is 0.15-0.5 mm.

3. The bone conduction speaker of claim 1, wherein: the thickness of the sound control sheet is 0.8-1.4 mm.

4. The bone conduction speaker of claim 1, wherein: the magnetic assembly comprises a first magnet and a second magnet which are respectively arranged on two sides of the coil.

5. The bone conduction speaker of claim 1, wherein: the bone conduction speaker further comprises a conduction bracket positioned at the bottom of the conduction shell, the coil is positioned on the conduction bracket, and the magnetic component is positioned on the conduction shell.

6. The bone conduction speaker of claim 5, wherein: the thickness of the conduction support is 0.4-0.8 mm.

7. The bone conduction speaker of claim 5, wherein: the conduction shell comprises a first top plate, two first supporting plates and second supporting plates, wherein the two first supporting plates are formed by downwards extending from two opposite sides of the first top plate, the second supporting plates are formed by inwards bending the bottom ends of the two first supporting plates respectively, a rectangular groove is formed in the first top plate, the sound control piece corresponds to the rectangular groove and is connected to the first top plate, and the conduction support is attached to the bottom of the second supporting plate.

8. The bone conduction speaker of claim 7, wherein: accuse sound piece is "ten" style of calligraphy, including being located the diaphragm of rectangular channel top and the riser of being connected with the diaphragm, riser both ends butt is fixed in first roof top surface.

9. The bone conduction speaker of claim 8, wherein: the length and the width of the transverse plate are smaller than those of the rectangular groove.

10. The bone conduction speaker of claim 5, wherein: the coil is sleeved on the guide post so as to be fixed on the conduction bracket through the guide post.